Broad beans (favas / bondebønner) will easily cross with other varieties that are growing nearby.  In order to keep a variety pure, you need to isolate them physically. I’ve chosen a different strategy and manage to maintain a mix of different bean colour and size forms by selecting for these characteristics every autumn. This automatically gives different flower colours too (broad beans are beautiful enough to be included in the edimental category and are also edi-ento-mentals as they are also extremely popular with bumblebees). Here are my selections which I made yesterday after drying the beans for storage.

Each form will be stored separately and each variety will be planted close to each other in a large block of beans containing many different forms! I think that diversity within a species also contributes to a good harvest with better bean set. I have never had a crop failure using my own home saved mix of beans. I don’t offer the different forms as named varieties, but as a mix or composite “Væres Venner* Mix” through the KVANN / Norwegian Seed Savers yearbook (kvann.no) in February so that others can also select for separate forms!
*Væres Venner is the community garden where most are grown.
See also this post showing the diversity of flowers that produced these beans: https://www.edimentals.com/blog/?p=26183